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Yamamoto Chemicals, Inc.

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USPTO Granted Patents = 73

% Expired Patents = 11.0

EPO Patents = 7

Forward Citations = 423

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87 inventors (with patents filed for the assignee):

Takahisa Oguchi (21 out of 24 patents)

Hisato Itoh (19 out of 49 patents)

Shigeo Fujita (15 out of 30 patents)

4. Kenichi Sugimoto (13 out of 72 patents)

5. Yojiro Kumagae (12 out of 16 patents)

6. Mansuke Matsumoto (11 out of 11 patents)

7. Nobuaki Sasaki (10 out of 10 patents)

8. Katashi Enomoto (10 out of 19 patents)

9. Sumio Hirose (9 out of 23 patents)

10. Shin Aihara (9 out of 14 patents)

11. Keisuke Takuma (8 out of 49 patents)

12. Sayuri Wada (8 out of 8 patents)

13. Toshihiro Masaoka (7 out of 8 patents)

14. Hideki Umehara (7 out of 14 patents)

15. Hiroyuki Sasaki (6 out of 12 patents)

Core Competencies:

Optical Recording Medium

Phthalocyanine Compounds

Near Infrared Absorbers

Light Absorber

Ink Composition

Organic Transistor

Polymer Electroluminescent

Coloring Material

Photothermal Conversion Material

Heat-Sensitive Recording

Naphthalocyanine Compound

Polymethine Compounds

73 patents: Sort by Forward Citations

1. 12624238 - Printed material (2026-05-12),

2. 12486239 - Benzotriazole compound, light absorber, and resin composition (2025-12-02),

3. 11326066 - Ink composition for PTP package, and ink (2022-05-10),

4. 11174274 - Naphthalocyanine compound, method for producing same, and use thereof (2021-11-16),

5. 11015061 - Phthalocyanine-based compound and uses of same (2021-05-25),

6. 10640456 - Compound and intermediate thereof (2020-05-05),

7. 10627650 - Optical material and use thereof (2020-04-21),

8. 9857503 - Optical material and use thereof (2018-01-02),

9. 9708244 - Coloring material and method for producing the same (2017-07-18),

10. 9266905 - Color material and method for producing the same (2016-02-23),

11. 8888906 - Heat-sensitive color-developing composition and heat-sensitive recording material comprising the composition (2014-11-18),

12. 8294144 - Organic transistor (2012-10-23),

13. 8012608 - Polymer containing sulfo group and organic electroluminescent element containing the polymer (2011-09-06),

14. 7709660 - Polymethine ether compounds (2010-05-04),

15. 7485404 - Nonsolvate-form crystal of polymethine compound and process for producing the same (2009-02-03),

Company Overview

Yamamoto Chemicals, Inc., based in Yao, Japan, specializes in the development and manufacturing of advanced optical materials. The company focuses on innovative solutions in optical recording mediums and phthalocyanine compounds, catering to various applications in the electronics and materials sectors. Their expertise extends to near-infrared absorbers, light absorbers, and specialized ink compositions, as well as organic transistors and polymer electroluminescent materials, positioning them as a key player in the optical technology landscape.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

73 Patents

#1 in Yao

#1,380 in Japan

#10,273 in the World

Yamamoto Chemicals, Inc.

Forward Citations = 423

87 inventors:

Takahisa Oguchi (21 out of 24 patents)

Hisato Itoh (19 out of 49 patents)

Shigeo Fujita (15 out of 30 patents)

4. Kenichi Sugimoto (13 out of 72 patents)

5. Yojiro Kumagae (12 out of 16 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Yamamoto Chemicals, Inc.. Retrieved from https://idiyas.com/company/yamamoto-chemicals

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

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